Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-07-26
2005-07-26
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S077040
Reexamination Certificate
active
06922304
ABSTRACT:
In a positioning control apparatus, a distance between an actual position at which absolute values of N and Q head positioning signals whose amplitudes vary cyclically in accordance with a position of a magnetic head and whose phases are different from each other by 90 degrees are equal to each other and an optimum position at which the absolute values of N and Q head positioning signals should be equal to each other is calculated from a deviation of an actual position of the magnetic head with respect to a target value of zero which deviation is obtained when controlling the magnetic head to be positioned at a boundary between ranges in which the N and Q head positioning signals have respective linearities so that the absolute values of N and Q head positioning signals become equal to each other.
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Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Hudspeth David
Tzeng Fred F.
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